Minecraft oceans on their own are really lame, aren't they? Just gravel, sand, and flat, boring kelp. It's the same thing no matter the biome.
Well, Beautiful is a pack I made when I got interested in Subnautica - and how its nature could look in Minecraft. I expanded oceans with new, colorful and varied flora. Kelp is now varied and has glowing, yellow seeds. In deep lukewarm oceans you can find reddish, crimson flora. Kelp has adapted to the cold biomes. See images for more.
Beautiful was designed to work with other resource packs, notably 16x16 ones. You also need OptiFine to get the most out of it. This pack is also still in development.
If you want to try out an extensive 1.16.5 modpack, or want to see my other resource packs, please check out my other things!